NFS: Label the dentry with a verifier in nfs_link(), nfs_symlink()

After the success of an operation such as link(), or symlink(), we
expect to add the dentry back to the dcache as an ordinary positive
dentry.
However in NFS, unless it is labelled with the appropriate verifier for
the parent directory state, then nfs_lookup_revalidate will end up
discarding that dentry and forcing a new lookup.

The fix is to ensure that we relabel the dentry appropriately on
success.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 1a6d2867fba4f7ffd77be2c626b0ce4592d5cf28..baca036f38901566973b8b3254b51aba08a56199 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2352,6 +2352,8 @@ int nfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
                return error;
        }
 
+       nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
+
        /*
         * No big deal if we can't add this page to the page cache here.
         * READLINK will get the missing page from the server if needed.
@@ -2385,6 +2387,7 @@ nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
        d_drop(dentry);
        error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
        if (error == 0) {
+               nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
                ihold(inode);
                d_add(dentry, inode);
        }